package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;
import java.util.UUID;

@RequestMapping("/common")
@RestController
@Slf4j
public class CommonController {


    @Value("${reggie.path}")
    private String basePath;

    /**
     * 菜品图片文件上传
     *
     * @param file
     * @return
     */

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info( file.toString() );

        //原始文件名
        String originalFilename = file.getOriginalFilename();//abc.jpg
        String suffix = originalFilename.substring( originalFilename.lastIndexOf( "." ) );

        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;//dfsdfdfd.jpg

        //创建一个目录对象
        File dir = new File( basePath );
        //判断当前目录是否存在
        if (!dir.exists()) {
            //目录不存在，需要创建
            dir.mkdirs();
        }

        try {
            //将临时文件转存到指定位置
            file.transferTo( new File( basePath + fileName ) );
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success( fileName );
    }


    /**
     * 文件下载
     */

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {

        try {
            FileInputStream fileInputStream = new FileInputStream( new File( basePath + name ) );

            ServletOutputStream outputStream = response.getOutputStream();

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read( bytes )) != -1) {
                outputStream.write( bytes, 0, len );
                outputStream.flush();
            }


        } catch (Exception e) {
            e.printStackTrace();
        }


    }



}
